If you have a regular menstrual cycle of 28-30 days, 7 days before and 8 days after your period is considered a safe period. 7 days before your period belongs to the luteal phase, when the ovaries should have finished ovulating and the eggs are alive for only 24 hours, and the sperm cannot combine with the eggs after entering the luteal phase. The follicular phase occurs 8 days after menstruation, when the follicles in the ovaries are not yet mature, and the ovaries generally do not ovulate at this time, so the chances of getting pregnant during intercourse are not great. The other times are the ovulation period, which is the danger period, and the chance of pregnancy is still relatively high, but the safety period is not very safe, the ovaries have occasional accidental ovulation, it is not recommended as a conventional contraceptive method. It is recommended to take short-acting contraceptive pills, wear condoms, place birth control devices for contraception, but also can be buried under the skin contraceptive pills is what people call skin burial to contraception.